.index {
    height: 750px;
    width: 750px;
    display: flex;
    flex-wrap: wrap;
    text-align: center;
    justify-content: center;
}
.square {
    width: 6.66vw;
    height: 6.66vw;
    line-height: 6.66vw;
    // box-sizing: border-box;
    font-size: 36px;
    // border: 2px solid #000000;
    background-image: url('../../souce/image/ten.png');
    background-size: 100% 100%;

}

.row {
    width: 750px;
    display: flex;
}

.blackPiece {
    width: 6vw;
    height: 6vw;
    background: #000;
    border-radius: 50%;
    border: 1px solid #333;
    text-align: center;
    margin: .33vw;
}

.whitePiece {
    width: 6vw;
    height: 6vw;
    background: #fff;
    border-radius: 50%;
    border: 1px solid #333;
    text-align: center;
    margin: .33vw;

}
